Which civilization is considered the earliest to exist?

The Mesopotamian Civilization

And here it is, the first civilization to have ever emerged. The origin of Mesopotamia dates back so far that there is no known evidence of any other civilized society before them. The timeline of ancient Mesopotamia is usually held to be from around 3300 BC to 750 BC

"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.

very positive impact on our industries in the west, sine they promoted settlement and increased the ways in which goods could be transported to market.